"This website is suspicious" on my website

Hi all,

My wife owns a website and I am responsible for maintaining it. Few visitors of her website have complained that they receive warning messages "This website is suspicious. Leave now unless you know this site is safe." Further the message states:

This recommendation is based on how long the site has been around and the strength of its security certificate.
...
- Site is not known phishing or spyware distributor
- Site is less that 3 month old
...

My wife has not purchased security certificate for this domain because there is no need of encrypted connections; hence there is no security certificate strength to be discussed here. Yes, the site is less than 3 month old, but this cannot be malicious property.

I found similar thread and the moderator there asks for the URL of the reported site. Here it is

Here is the screen-shot of the warning that the visitor kindly provided:

Is there some reasonable explanation my wife can offer to her visitors beside the obvious promoting of the premium product of CheckPoint?

Re: "This website is suspicious" on my website

Hi!
Sorry, link to private sites removed and the ZA forum link you referred is related to another problem (positive to spam list) not yours. Please note that ZA staff does not monitor this board, we are all users. No use to report it here.

You have to do it via the forcefield interface as explained here (copied below - Thank you Garywa for the screenshot!)

I read the information and knowing where and how I had gotten there I simply clicked on the "click here" link and was presented with this short message: